terminal.coffee

   1 async = require 'async'
   2 fs = require 'fs'
   3
   4 class Terminal
   5         # public:
   6         constructor: (width, height) ->
   7                 @width = 1
   8                 @height = 1
   9                 @text = []
  10                 @attributes = []
  11                 @x = 0
  12                 @y = 0
  13                 @a = 0 # cursor attributes
  14                 @partial = ''
  15                 @resize width, height
  16
  17         resize: (width, height) ->
  18                 # FIXME: write a version that retains some of the data
  19                 @width = width
  20                 @height = height
  21                 @text = []
  22                 @attributes = []
  23                 for y in [0...height]
  24                         @text[y] = []
  25                         @attributes[y] = []
  26                         for x in [0...width]
  27                                 @text[y].push ' '
  28                                 @attributes[y].push 0
  29
  30         # pass data from stdout
  31         update: (data) ->
  32                 return unless data?.length > 0
  33                 if @partial.length > 0
  34                         data = @partial + data
  35                         @partial = ''
  36                 parts = data.split(/\x1b\[/)
  37                 if parts.length > 1
  38                         if -1 is @escape_sequence_length parts[parts.length - 1]
  39                                 @partial = parts.pop()
  40                 if parts.length > 0
  41                         for i in [0...parts.length]
  42                                 if i is 0
  43                                         @update_text parts[i]
  44                                 else
  45                                         @update_sequence_then_text parts[i]
  46                 return
  47
  48         clear_rest_of_line: ->
  49                 for i in [@x...@width]
  50                         @text[@y][i] = ' '
  51                         @attributes[@y][i] = @a
  52
  53         add_new_line: ->
  54                 # clear top line
  55                 for i in [0...@width]
  56                         @text[0][i] = ' '
  57                         @attributes[0][i] = 0
  58                 # move (newly cleared) top line to the bottom
  59                 tmp = @text.shift()
  60                 @text.push(tmp)
  61                 tmp = @attributes.shift()
  62                 @attributes.push(tmp)
  63                 # slide cursor up with rest of text
  64                 @y -= 1
  65
  66         wrap_to_next_line: ->
  67                 if @y is @height - 1
  68                         @add_new_line()
  69                 @y += 1
  70                 @x = 0
  71
  72         # str has no escape sequences
  73         update_text: (str) ->
  74                 return unless str.length > 0
  75                 for c in str
  76                         switch c
  77                                 when '\t' # tab
  78                                         @update_text "        ".substr(@x % 8)
  79                                 when '\x07' # bell
  80                                         false
  81                                 when '\x0d' # cr
  82                                         @x = 0
  83                                 when '\x08' # backspace
  84                                         if @x > 0
  85                                                 @x -= 1
  86                                                 @text[@y][@x] = ' '
  87                                                 # should this set the attribute too?
  88                                 when '\x0a', '\x0b' # lf, vertical tab (same thing)
  89                                         @wrap_to_next_line()
  90                                 else
  91                                         @text[@y][@x] = c
  92                                         @attributes[@y][@x] = @a
  93                                         @x += 1
  94                                         if @x is @width
  95                                                 @wrap_to_next_line()
  96                 return
  97
  98         set_attribute_bits: (mask, value) ->
  99                 @a = (@a & ~mask) | value
 100
 101         csi_m: default: "0", go: ->
 102                 for i in arguments
 103                         switch i
 104                                 when '0'
 105                                         @set_attribute_bits 0xffffff, 0
 106                                 when '1' # bold
 107                                         @set_attribute_bits 0x100, 1
 108                                 when '4' # underline
 109                                         @set_attribute_bits 0x200, 1
 110                                 when '5' # blink
 111                                         @set_attribute_bits 0x400, 1
 112                                 when '8' # invisible
 113                                         @set_attribute_bits 0x800, 1
 114
 115                                 when '22' # not bold... according to a page
 116                                         @set_attribute_bits 0x100, 0
 117                                 when '21' # ... though this would make more sense for "not bold"
 118                                         @set_attribute_bits 0x100, 0
 119                                 when '24' # not underline
 120                                         @set_attribute_bits 0x200, 0
 121                                 when '25' # not blink
 122                                         @set_attribute_bits 0x400, 0
 123                                 when '28' # not invisible
 124                                         @set_attribute_bits 0x800, 0
 125
 126                                 when '30' # fg black
 127                                         @set_attribute_bits 0xff, 0
 128                                 when '31' # fg red
 129                                         @set_attribute_bits 0xff, 0xe0
 130                                 when '32' # fg green
 131                                         @set_attribute_bits 0xff, 0x1c
 132                                 when '33' # fg yellow
 133                                         @set_attribute_bits 0xff, 0xfc
 134                                 when '34' # fg blue
 135                                         @set_attribute_bits 0xff, 0x02
 136                                 when '35' # fg magenta
 137                                         @set_attribute_bits 0xff, 0xe2
 138                                 when '36' # fg cyan
 139                                         @set_attribute_bits 0xff, 0x1f
 140                                 when '37', '39' # fg white  (39 is default)
 141                                         @set_attribute_bits 0xff, 0xff
 142
 143                                 when '40' # bg black
 144                                         @set_attribute_bits 0xff00, 0
 145                                 when '41' # bg red
 146                                         @set_attribute_bits 0xff00, 0xe000
 147                                 when '42' # bg green
 148                                         @set_attribute_bits 0xff00, 0x1c00
 149                                 when '43' # bg yellow
 150                                         @set_attribute_bits 0xff00, 0xfc00
 151                                 when '44' # bg blue
 152                                         @set_attribute_bits 0xff00, 0x0200
 153                                 when '45' # bg magenta
 154                                         @set_attribute_bits 0xff00, 0xe200
 155                                 when '46' # bg cyan
 156                                         @set_attribute_bits 0xff00, 0x1f00
 157                                 when '47', '49' # bg white  (49 is default)
 158                                         @set_attribute_bits 0xff00, 0xff
 159
 160                                 else
 161                                         # if we don't recognize the style, go back to default
 162                                         @set_attribute_bits 0xffffff, 0
 163                 return
 164
 165         # str is the whole escape sequence (minus the esc[ prefix)
 166         update_sequence: (str) ->
 167                 command = @["csi_#{str.substr str.length - 1}"]
 168                 return unless command?
 169                 args = str.substr(0, str.length - 1).split ';'
 170                 for i in [0...args.length]
 171                         if args[i] is ''
 172                                 args[i] = command.default
 173                 command.go.call this, args...
 174
 175         update_sequence_then_text: (str) ->
 176                 len = @escape_sequence_length str
 177                 if len is -1
 178                         console.log "couldn't find escape sequence here: #{str.substr 0, 25}"
 179                         @update_text "ESC[" + str
 180                 else
 181                         @update_sequence str.substr 0, len
 182                         @update_text str.substr len
 183
 184         escape_sequence_length: (str) ->
 185                 parts = str.match(/^[0-9;?]{0,25}./)
 186                 return -1 unless parts?
 187                 return parts[0].length
 188
 189 exports.new = (width, height) ->
 190         return new Terminal width, height